Granted Patent
Utility
US 4,312,911 · App. 06/105,320
Chromium oxide coated refractory fibers
Inventors:
Russell D. Smith, Richard E. Tressler
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Dec 19, 1979
Inventors
Russell D. Smith
Richard E. Tressler
Assignee (at issue)
Kennecott Holdings Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.